> problem is
> bmake.boot was compiled by gcc
>     gcc -D_ALL_SOURCE *.o lst.lib/*.o -o bmake.boot  -L../../libnbcompat -lnbcompat
> then pass CC=gcc to bmake.boot 
>     CC="gcc -D_ALL_SOURCE" LIBC= MAKEFLAGS= MAKESYSPATH=`pwd`/mk:mk:/usr/pkg/share/mk:/usr/share/mk:/usr/local/share/mk:/opt/share/mk ./bmake.boot -f Makefile
>     c89 -O -D_PATH_DEFSYSPATH=\"/usr/pkg/share/mk\" -I. -I/var/tmp/obj/pkgsrc/bmake -DHAVE_CONFIG_H  -I../../libnbcompat -I/var/tmp/obj/pkgsrc/bmake/missing -DNEED_HOST_CDEFS_H  -DMAKE_NATIVE  -DSIGNAL_FLAGS=SA_RESTART  -Werror  -c /var/tmp/obj/pkgsrc/bmake/arch.c
> 
> Why c89 was called?

Ok, in /usr/share/mk/sys.mk:

CC=c89

Then:

% env MAKESYSPATH=/usr/pkg/share/mk:/usr/share/mk ./bmake.boot -V CC
c89
% env MAKESYSPATH=/usr/share/mk:/usr/pkg/share/mk ./bmake.boot -V CC
c89
% env CC=gcc MAKESYSPATH=/usr/share/mk:/usr/pkg/share/mk ./bmake.boot -V CC
c89
% env CC=gcc MAKESYSPATH=/usr/pkg/share/mk:/usr/share/mk ./bmake.boot -V CC
c89
% env MAKESYSPATH=/usr/pkg/share/mk ./bmake.boot -V CC
gcc -D_ALL_SOURCE
% env CC=gcc MAKESYSPATH=/usr/pkg/share/mk ./bmake.boot -V CC
gcc
% ./bmake.boot -m /usr/share/mk:/usr/pkg/share/mk -V CC
gcc -D_ALL_SOURCE

What?

--
OBATA Akio
obata@lins.jp